This biestable touch circuit was found in American 1980s documentation. The circuit must not be powered by a source without a transformer. Sensitivity depends on the 10 M resistors.
This filter was found in a publication for radio amateurs in 1977. The components can be changed for...
This circuit generates a signal that resembles the sound of a triangle. We found it in an English...
This telecommunications circuit was found in a National Semiconductor publication from the 90s. It is...